Update to v2.9.3

Fixed an issue with DropBox sync process (#325)
Fixed an memory leak issue in Chrome where prerenderred tab information  was not removed when the tab id was changed. (#324)
Modified the 'Help Spread the Word' link in the popup menu to open a new tab instead of being loaded in the menu (#318)
Fixed an issue in Safari with un-whitelisting a site (blacklisting it)(#317)
Improved the string processing of debug information when users report an issue or ad to the AdBlock support site (#307)
Update to v2.9.4

Updated Translastions